DATASHEET
ISL267440, ISL267450A
10-Bit and 12-Bit, 1MSPS SAR ADCs
The ISL267440 and ISL267450A are 10-bit and 12-bit, 1MSPS
sampling SAR-type ADCs featuring excellent linearity over
supply and temperature variations. These devices are drop-in
compatible with the AD7440 and AD7450A. The robust,
fully-differential input offers high impedance to minimize
errors due to leakage currents, and the specified
measurement accuracy is maintained with input signals up to
the supply rails.
The reference accepts inputs from 0.1V to 2.2V for 3V
operation and 0.1V to 3.5V for 5V operation. This provides
design flexibility in a wide variety of applications. The
ISL267440, ISL267450A also feature up to 8kV Human Body
Model ESD survivability.
The serial digital interface is SPI compatible and is easily
interfaced to popular FPGAs and microcontrollers. Power
dissipation is 8.5mW at a sampling rate of 1MSPS, and just
5µW between conversions utilizing Auto Power-Down mode
(with a 5V supply). The ISL267440, ISL267450A are excellent
solutions for remote industrial sensors and battery-powered
instruments.
The ISL267440, ISL267450A are available in an 8 lead MSOP
package, and are specified for operation over the Industrial
temperature range (–40°C to +85°C).
FN7708
Rev.2.00
June 28, 2012
Features
• Drop-in Compatible with AD7440, AD7450A
• Differential Input
• Simple SPI-compatible Serial Digital Interface
• Guaranteed No Missing Codes
• 1MHz Sampling Rate
• 3V or 5V Operation
• Low Operating Current
- 1.25mA at 1MSPS with 3V Supplies
- 1.70mA at 1MSPS with 5V Supplies
• Power-down Current between Conversions: 1µA
• Excellent Differential Non-Linearity
• Low THD: -83dB (typ)
• Pb-Free (RoHS Compliant)
• Available in MSOP Package
Applications
• Remote Data Acquisition
• Battery Operated Systems
• Industrial Process Control
• Energy Measurement
• Data Acquisition Systems
• Pressure Sensors
• Flow Controllers
1.0
0.8
0.6
VREF
DAC
VDD
0.4
DNL (LSB)
0.2
0.0
-0.2
-0.4
-0.6
VIN+
VIN–
DAC
SAR
LOGIC
SERIAL
INTERFACE
SCLK
SDATA
CS
VREF
-0.8
-1.0
GND
0
1024
2048
CODE
3072
4096
FIGURE 1. BLOCK DIAGRAM
FIGURE 2. DIFFERENTIAL LINEARITY ERROR vs CODE
FN7708 Rev.2.00
June 28, 2012
Page 1 of 18
ISL267440, ISL267450A
Typical Connection Diagram
VREF
0.1µF
+3V/5V
0.1µF + 10µF SUPPLY
VREF
REF
P-P
REF
P-P
VIN+
VIN–
GND
VDD
SCLK
SDATA
CS
SERIAL
INTERFACE
µP/µC
Pin Configuration
ISL267440, ISL267450A
(8 LD MSOP)
TOP VIEW
VREF 1
VIN+ 2
VIN– 3
GND 4
8 VDD
7 SCLK
6 SDATA
5 CS
Pin Descriptions
ISL267440, ISL267450A
PIN NAME
VDD
SCLK
SDATA
CS
GND
VIN–
VIN+
VREF
PIN NUMBER
8
7
6
5
4
3
2
1
Supply voltage, +2.7V to 5.25V.
Serial clock input. Controls digital I/O timing and clocks the conversion.
Digital conversion output.
Chip select input. Generally controls the start of a conversion though not always the sampling signal.
Ground
Negative analog input.
Positive analog input.
Reference voltage.
DESCRIPTION
FN7708 Rev.2.00
June 28, 2012
Page 2 of 18
ISL267440, ISL267450A
Ordering Information
PART NUMBER
(Note 4)
ISL267440IUZ (Note 3)
ISL267440IUZ-T (Notes 1, 3)
ISL267440IUZ-T7A (Notes 1, 3)
ISL267450AIUZ (Note 3)
ISL267450AIUZ -T (Notes 1, 3)
ISL267450AIUZ -T7A (Notes 1, 3)
ISL267440IHZ-T (Notes 1, 2)
ISL267440IHZ-T7A (Notes 1, 2)
ISL267450AIHZ-T (Notes 1, 2)
ISL267450AIHZ-T7A (Notes 1, 2)
NOTES:
1. Please refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu plate
-e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
4. For Moisture Sensitivity Level (MSL), please see device information page for
ISL267440
or
ISL267450A.
For more information on MSL please see
techbrief
TB363.
5. The part marking is located on the bottom of the part.
PART
MARKING
67440
67440
67440
7450A
7450A
7450A
7440 (Note 5)
7440 (Note 5)
450A (Note 5)
450A (Note 5)
V
DD
RANGE
(V)
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
TEMP RANGE
(°C)
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
PACKAGE
8 Ld MSOP
8 Ld MSOP
8 Ld MSOP
8 Ld MSOP
8 Ld MSOP
8 Ld MSOP
8 Ld SOT-23
8 Ld SOT-23
8 Ld SOT-23
8 Ld SOT-23
PKG.
DWG. #
M8.118
M8.118
M8.118
M8.118
M8.118
M8.118
P8.064
P8.064
P8.064
P8.064
FN7708 Rev.2.00
June 28, 2012
Page 3 of 18
ISL267440, ISL267450A
Table of Contents
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Timing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
ADC Transfer Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Reference Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Converter Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Acquisition Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short Cycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power vs Throughput Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
11
12
13
13
13
13
14
Serial Digital Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Signal-to-(Noise + Distortion) Ratio (SINAD). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total Harmonic Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Peak Harmonic or Spurious Noise (SFDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intermodulation Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Aperture Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Aperture Jitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Full Power Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Common-Mode Rejection Ratio (CMRR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integral Nonlinearity (INL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential Nonlinearity (DNL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Zero-Code Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Positive Gain Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Negative Gain Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Track and Hold Acquisition Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Rejection Ratio (PSRR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
15
15
15
15
15
15
15
15
15
15
15
15
16
16
Application Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Grounding and Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
M8.118 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
P8.064 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
FN7708 Rev.2.00
June 28, 2012
Page 4 of 18
ISL267440, ISL267450A
Absolute Maximum Ratings
Any Pin to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.0V
Analog Input to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to V
DD
+0.3V
Digital I/O to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to V
DD
+0.3V
Digital Input Voltage to GND . . . . . . . . . . . . . . . . . . . . . . . -0.3V to V
DD
+0.3V
Maximum Current In to Any Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
ESD Rating
Human Body Model (Tested per JESD22-A114F) . . . . . . . . . . . . . . . . 8kV
Machine Model (Tested per JESD22-A115B) . . . . . . . . . . . . . . . . . 400V
Charged Device Model (Tested per JESD22-C101E). . . . . . . . . . . . 1.5kV
Latch Up (Tested per JESD78C; Class 2, Level A) . . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
8 Ld MSOP Package (Notes 6, 7). . . . . . . . .
165
64
8 Ld SOT-23 Package (Notes 6, 7). . . . . . . .
135
99
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
6.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
7. For
JC
, the “case temp” location is taken at the package top center.
Electrical Specifications
V
DD
= +3.0V to +3.6V, f
SCLK
= 18MHz, f
S
= 1MSPS, V
REF
= 2.0V; V
DD
= +4.75V to +5.25V, f
SCLK
= 18MHz,
f
S
= 1MSPS, V
REF
= 2.5V; V
CM
= V
REF
, unless otherwise noted. Typical values are at T
A
= +25°C. Boldface limits apply over the operating temperature
range, -40°C to +85°C.
ISL267440
SYMBOL
SINAD
PARAMETER
TEST CONDITIONS
MIN
(Note 8)
61.0
60.7
TYP
61.6
61.5
-82
-80
-82
-82
-92
1
15
@ –3dB
10
-0.5
Guaranteed no missed codes to 12-
bits (ISL267450A) or 10 bits
(ISL267440)
Zero Volt Differential Input
± REF input range
-0.5
±0.1
±0.1
0.5
0.5
15
12
-1
-0.95
±0.4
±0.3
1
0.95
-74
-72
-76
-74
MAX
MIN
(Note 8) (Note 8)
70.0
68.5
ISL267450A
TYP
71.4
70.5
-84
-84
-87
-85
-95
1
15
15
-76
-74
-76
-74
MAX
(Note 8) UNITS
dB
dB
dB
dB
dB
dB
dB
ns
ps
MHz
Bits
LSB
LSB
DYNAMIC PERFORMANCE
Signal-to (Noise + Distortion) Ratio f
IN
= 100kHz
V
DD
= +4.75V to +5.25V
f
IN
= 100kHz
V
DD
= +3.0V to +3.6V
THD
Total Harmonic
Distortion
f
IN
= 100kHz
V
DD
= +4.75V to +5.25V
f
IN
= 100kHz
V
DD
= +3.0V to +3.6V
SFDR
Spurious Free Dynamic Range
f
IN
= 100kHz
V
DD
= +4.75V to +5.25V
f
IN
= 100kHz
V
DD
= +3.0V to +3.6V
IMD
tpd
tpd
3dB
N
INL
DNL
Intermodulation Distortion
Aperture Delay
Aperture Jitter
Full Power Bandwidth
Resolution
Integral Nonlinearity
Differential Nonlinearity
2nd and 3rd order, f
IN
= 90kHz,
110kHz
DC ACCURACY
OFFSET
GAIN
Zero-Code Error
Positive Gain Error
Negative Gain Error
Full-Scale Input Span
-2.5
-1
-1
±0.2
±0.1
±0.1
VIN+ - VIN–
2.5
1
1
-6
-2
-2
±0.2
±0.1
±0.1
VIN+ - VIN–
6
2
2
LSB
LSB
LSB
V
ANALOG INPUT (Note 9)
|AIN|
2 x V
REF
FN7708 Rev.2.00
June 28, 2012
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